The life span of the fruit flies which were fed with the medium containing carrot juice was longer than those fed with the medium containing radish juice.

• 在玉米粉培养基上分别添加胡萝卜汁和白萝卜汁喂养果蝇,吃胡萝卜汁的果蝇平均寿命和最高寿命都较长;